windows ce_com.txt

Windows CE下串行通信的实现,接受GPS数据例子

Windows CE下串行通信的实现,接受GPS数据例子

GPS数据接收程序代码如下：
. //初始化
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{	HWND	hWnd;
		HANDLE hThread;
unsigned long rc;
	g_hSendEvent=CreateEvent(NULL,FALSE,FALSE,NULL);//创建事件
	hThread=CreateThread(NULL,0,SendThread,hWnd,0,&rc);//创建写线程
	if(hThread)
		CloseHandle(hThread);
	else
	{	DestroyWindow(hWnd);
		return 0;
	}
	ShowWindow(hWnd, nCmdShow);
	UpdateWindow(hWnd);
		return TRUE;
}
//写线程
unsigned long SendThread(PVOID pArg)
{
	HWND hWnd,hwndSText;
	unsigned long cBytes,nGoCode;
	TCHAR szText[TEXTSIZE];
	
	hWnd=(HWND)pArg;
	hwndSText=GetDlgItem(hWnd,IDE_SEND);//获得发送文本框的句柄
		
	while(1)
	{
		nGoCode=WaitForSingleObject(g_hSendEvent,INFINITE);//等待事件有信号
		if(nGoCode==WAIT_OBJECT_0)
		{
			GetWindowText(hwndSText,szText,dim(szText));//得到文本框内的文本
			BYTE buffer[10]={0x2};
			WriteFile(hComPort,buffer,10,&cBytes,0);//把文本发送到串口
			SetWindowText(hwndSText,TEXT(""));//清空发送文本框
		}
		else
			break;
	}
	return 0;
}
//读线程
unsigned long ReadThread(PVOID pArg)
{	BYTE szText[170],*pPtr;
	pPtr=szText;
	TCHAR str[220]={0};
	     TCHAR temp[10];
	hWnd=(HWND)pArg;
	while(hComPort!=INVALID_HANDLE_VALUE)
	    {	ReadFile(hComPort,szText,170,&cBytes,0);//从串口读回数据
	     ……………
	//数据处理
……………
		}
	}
//“打开串口”按钮处理消息函数
LPARAM DoMainCommandOpen(HWND hWnd,WORD idItem,HWND hwndCtl,WORD wNotifyCode)
{	DCB dcb;//定义DCB结构变量
	HWND hBtn;
	COMMTIMEOUTS cto;//定义结构COMMTIMEOUTS变量
	HANDLE hLocal;
	DWORD dwTSat;
	hBtn=GetDlgItem(hWnd,IDB_OPEN);
	if(hComPort==INVALID_HANDLE_VALUE)
		{hComPort=CreateFile(TEXT("COM1:"),GENERIC_READ|GENERIC_WRITE,
0,NULL,OPEN_EXISTING,0,NULL);//打开串口
		if(hComPort!=INVALID_HANDLE_VALUE)
		{	GetCommState(hComPort,&dcb);//获取当前串口配置
			dcb.BaudRate =nSpeed;
			dcb.fParity =FALSE;
			dcb.fNull=FALSE;
			dcb.StopBits=ONESTOPBIT;
			dcb.Parity=NOPARITY;
			dcb.ByteSize=8;
			SetCommState(hComPort,&dcb);//设置串口配置
			cto.ReadIntervalTimeout=0;
			cto.ReadTotalTimeoutMultiplier=0;
			cto.ReadTotalTimeoutConstant=0;
			cto.WriteTotalTimeoutConstant=0;
			cto.WriteTotalTimeoutMultiplier=0;
			SetCommTimeouts(hComPort,&cto);//设置串口超时
			if(!GetExitCodeThread(hReadThread,&dwTSat)||(dwTSat!=STILL_ACTIVE))
	{	//创建读线程
hReadThread=CreateThread(NULL,0,ReadThread,hWnd,0,&dwTSat);
				if(hReadThread)
				CloseHandle(hReadThread);
			}
			SetWindowText(hBtn,TEXT("Close"));
			}
		}
	else
	 	{	CloseHandle(hComPort);
			SetWindowText(hBtn,TEXT("Open"));
			hComPort=INVALID_HANDLE_VALUE;
		}
	return 0;
}
//“发送”按钮处理消息函数
LPARAM DoMainCommandSend(HWND hWnd,WORD idItem,HWND hwndCtl,WORD wNotifyCode)
{
	SetEvent(g_hSendEvent);//设置事件为有信号状态
	SetFocus(GetDlgItem(hWnd,IDE_SEND));
	return 0;
}